netfilter: ip6t_REJECT: check for IP6T_F_PROTO

Make sure IP6T_F_PROTO is set to enforce layer 4 protocol matching from
the ip6_tables core.

Suggested-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
1 file changed